deb http://us.archive.ubuntu.com/ubuntu/ natty main restricted
deb http://us.archive.ubuntu.com/ubuntu/ natty-updates main restricted
deb http://us.archive.ubuntu.com/ubuntu/ natty universe
deb http://us.archive.ubuntu.com/ubuntu/ natty-updates universe
deb http://us.archive.ubuntu.com/ubuntu/ natty multiverse
deb http://us.archive.ubuntu.com/ubuntu/ natty-updates multiverse
deb http://security.ubuntu.com/ubuntu natty-security main restricted
deb http://security.ubuntu.com/ubuntu natty-security universe
deb http://security.ubuntu.com/ubuntu natty-security multiverse